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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENT - Assets measured at fair value and Supplemental fair value information (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Mar. 19, 2015
Liabilities:      
Contingent earnout liability $ 14,879    
Supplemental fair value information about long-term fixed-rate debt      
Carrying value of long-term fixed-rate debt 492,902 $ 491,847  
Unsecured senior notes issued March 19, 2015      
Supplemental fair value information about long-term fixed-rate debt      
Debt issued 500,000   $ 500,000
Carrying value      
Supplemental fair value information about long-term fixed-rate debt      
Carrying value of long-term fixed-rate debt 492,900 491,800  
Total Measure at Fair Value | Recurring basis      
Short-term investments:      
Short-term investments 44,491    
Assets:      
Cash and cash equivalents 521,375    
Investments 70,173    
Other current assets 32,439    
Other assets 6,695    
Total assets measured at fair value 675,173    
Liabilities:      
Contingent earnout liability 14,879    
(Level 1) | Recurring basis      
Short-term investments:      
Short-term investments 24,853    
Assets:      
Cash and cash equivalents 521,375    
Investments 70,173    
Other current assets 32,189    
Other assets 6,695    
Total assets measured at fair value 655,285    
(Level 2) | Recurring basis      
Short-term investments:      
Short-term investments 19,638    
Assets:      
Other current assets 250    
Total assets measured at fair value 19,888    
(Level 2) | Total Measure at Fair Value      
Supplemental fair value information about long-term fixed-rate debt      
Fair value of long-term fixed-rate debt 529,000 $ 529,600  
(Level 3)      
Liabilities:      
Contingent earnout liability 14,879    
Certificates of deposit | Total Measure at Fair Value | Recurring basis      
Short-term investments:      
Short-term investments 1,500    
Certificates of deposit | (Level 2) | Recurring basis      
Short-term investments:      
Short-term investments 1,500    
Corporate and municipal debt securities | Total Measure at Fair Value | Recurring basis      
Short-term investments:      
Short-term investments 15,818    
Corporate and municipal debt securities | (Level 2) | Recurring basis      
Short-term investments:      
Short-term investments 15,818    
U.S. government and federal agency securities | Total Measure at Fair Value | Recurring basis      
Short-term investments:      
Short-term investments 27,173    
U.S. government and federal agency securities | (Level 1) | Recurring basis      
Short-term investments:      
Short-term investments 24,853    
U.S. government and federal agency securities | (Level 2) | Recurring basis      
Short-term investments:      
Short-term investments $ 2,320